Identity and Reference Frames

Is it possible to define one's identity (i.e. answer the question "Who are you?") without resorting to some sort of reference frame (e.g. "I am the son of so and so"), and if so, how?

And for that matter, is there anything at all out there, which can be defined without a raference frame? I would suspect there should be, perhaps even plenty of such things, but I can't quite think of any example...